# Why don't we feel centripetal force as we move from the outside of orbit to the inside?

In a debate with a flat earth friend and need help to make sure I understand this correctly. He points out that the part of earth that is on the outside of its orbit is traveling faster than the inside, so why don't we experience centripetal force as our speed changes. If you spin a basketball on your finger and walk forward, the part of the b-ball moving forward (away from you) is moving faster than the part moving backward (toward you). We feel even slight changes in speed in a car, and this would be a change in hundreds if not thousands of kph. So why don't we feel it? I have a lot of answers floating around in my head, but I'm not absolutely sure I know the correct answer. Can anyone help me out?

• I don't understand the question. Are you asking why we don't "feel" a centripetal force while on Earth's surface? Spoiler alert: gravity is a centripetal force in this case (centripetal is just a direction; it's not some special extra force that you "feel") Nov 28, 2022 at 10:49
• Ig its impossible to actually win the debate. Nov 28, 2022 at 11:14

If orbital period is constant, centripetal force is proportional to the radius of the orbit. The average radius of the Earth's orbit around the Sun is about $$150$$ million km. The diameter of the Earth is about $$12,700$$ km. So the difference in centripetal force from one side of the Earth to the other is about one part in $$12,000$$.